Toyota Relax Warranty - Expensive Service? (Spark Plugs)

Hi guys,

Do you think Toyota Relax warranty worth it? Each time you service in a dealership, you renew your warranty up to 185000km or 10 years.

I few months ago I had one of my cars serviced at dealership… Just gave what it needed, oil, filters, fluids and scans (they really just plug the scanner, I know…)… 200 euros, that's fine.

However, for the next service, I'll need to change the spark plugs, two brake pads, and two brake discs. The spark plugs alone cost 300 euros. I am pretty sure the breaks need the service and the Spark Plugs should be changed each 60000 miles and the car will have 60000 miles next service. I am pretty sure they would be fine for a few years, as they are iridium spark plugs and are in great condition. This is just dealership recommendation/manual. But 300 euros seems to be a bit overpriced for the service. Is this price correct?

I know the original spark plugs (Denso FC16HR-CY9) are quite expensive compared to other brands (the good ones) - like Bosch, but they should only cost around 100 euros. I'm not a mechanic, but I could replace them in 20 minutes, so why 300 euros? The labor shouldn't be that high as it's a very simple task.

So my question is, do you think it's worth servicing there to keep the Toyota Relax Warranty, or should I walk away and have my local mechanic service it instead? Is this warranty really worth it?